Matrix molding press



a i. m 9 1 .& n a 8 K 44 5 m 7 b M B H 5 3 I fl I 9\ 1 1 o I b Jan. 23, 1934.

Patented Jan. 23, 1934 I MATRIX MOLDING PRE SS Ernst Brockel, Augsburg, Germany, assignor to Maschinenfabrik Augsburg-Nurnberg A. G., Augsburg, Germany, a corporation of Germany Application December 22, 1931, Serial No. 582,530, and in Germany December 27, 1930 4 Claims. (Cl. 101-12) In hydraulic presses for molding matrices for hydraulic pressure will also bear upon the presstereotyping, or like uses, it is necessary to guide sure piston 3. the upward motion of the table in such manner, Until the type touches the molding .head- 6, that its upper surface during the rise may rethe table is guided with extreme accuracy, since main perfectly parallel with the lower surface of the piston 2 moves without play within its bore.-

the molding head. Parallelism in most of the It would be a mistake to make piston 2 and known machines of this kind has hitherto been pressure piston 3 in one piece, in orderto secure ensured by means of lateral guiding shoes which rigid connection or, for the, same purpose, to are fastened to the table top, or noses forming screw the piston 2 by means of aflange onto the part of the table top, gliding along pull rods of pressure piston, because in case thetype 5 orthe rectangular or round cross section, in conjuncpacking-9 were of uneven thickness, the table 4 tion with the pressure piston which is screwed and the pressure piston 3 would assume a slightly to the table. I oblique position, and in consequence the connect- In other machines lateral guides are dispensed ing P s of t e pi 2 a the P s D 15 with and the table motion is guided entirely by ton 3, or the piston 2 might suffer damage. means of the pressure piston; in these cases the According to the invention the piston 2 is conpressure piston in order to avoid tilting has to nected with the pressu piston 3 a novel be relatively long. her, by means of a rod '10 having a threaded head Both methods have certain disadvantages. 11 of larger diameter than t e od, whic head 20 When during operation the table is heated, it is screwed. intothe lower part of pressure piston expands. In order to avoid cramping consider- 3. Rod 10 is, with play, disposed within a bore able play has to be allowed for the guiding shoes t e p sto 2, a i conj w a Strong and noses. Because of this play, the form to Sp 12 Causes h tWO Pistons to be Pressed be molded may contact obliquely with the moldin one an her. T e sprin 1 i p vi 3.; 3 head, which t, only results in ulty compressed sufficiently to render the'connection matrices, but also unduly strains the frame. If Practically rigid, d P rfe alignment du the table-motion isto be guided by means of the t pward motion of th p ss pist n 3 is pressure piston only, the piston, for the reasons s enSl-lredalready mentioned, has to be of great length. S S0011 w v as e pr s P t 3 begins 110- The press consequently becomes excessively high, t x rt pr p th m d ad, a d

and the table top is placed at such a great disleads 0f considerably eate emellnt es t tance from the floor as to render service diflicult. p e Piston is free t assume an oblique p By the present invention all these drawbacks are sltlon d this b e necessary b ause avoided. of illineveg thickrlilessbgf eiitherfthetgpe or tle In the machine according to the'present in- D 111g S e qll y 0 D ion 5 ma e vention the table motion is guided by a special lg e i t g t 00111256551011 of guide piston and'neither. the pull rods nor the Sprmg W f F ex fi fl pressure piston take any part in this function. of h ,Li whlfm ,obtam durlng the f' 1t 15 On the annexed drawing, I have shown for fi s e p g g zi sgg' gf 2 3 purposes of illustration in Fig. 1 a side view of gi z yle mg lung 6 u o a ifi g g i novfeltgmtdmg g d i g Instead of the connection above described, with- .5 mo 1 ca o e essen a in the scope of the invention, any other kind 01' thereofyielding and elastic connection may, of course, 45- mm a base of the frame 1 an 011 fight-P151501. 2 be applied as, for example; that shown in Fig. 2. having a smaller diameter than the pressure pis- The spring in this case has been omitted and the ton 3 is fitted which is adapted to lift speedily rod 10 is made very long and ofsome highly 1 the pressure Piston 3.t0gether W the table 4 tic material erg. steel, or a'steel alloy; the slight and the type to be molded 5, so as to press the tensions which -may occur when dealing-with 1111-,- 50 latter against the molding head 6. The lifting evenly thick type or packing are taken up elasis effected by oil supplied under pressure through tically by a rod of this nature. Since the pressure a duct '2. Through another duct 8- a liquid is piston 3does not take part in the guiding of its sucked, in well-known manner, from a vessel (not upward motion it may be allowed a great deal shown) into the space under the pressure piston of play and the fitting section h of its circum- 55 3. At a later stage of the molding operation ferential surface may be so narrow, that in case of necessity, the table may easily assume the Y requisite oblique position.

I claim:

1. In a hydraulic molding press, a guide piston slidably mounted for only straight line movement, a separate pressure piston yieldably mounted on the guide piston, means for the actuation of the guide piston to move the pressure piston therewith to an operative position, and separate means for the subsequent actuation of the pressure piston independently of the guide piston.

2. In a hydraulic. molding press, a guide piston 3. In a hydraulic molding press, aguide piston slidably mounted for only straight line movement, 2. separate pressure piston, a rod secured rigidly at one end to the pressure piston and extending through the, guide piston, an abutment on, the other end of said rod, a coil spring between the guide piston and said abutment holding the two pistons yieldably in assembly with each other, and means for the actuation of said pistons.

4. In a hydraulic'molding press, a guide piston slidably mounted for only straight line movement, a separate pressure piston, the guide piston having a central opening, a flexible rod connected at one end to the pressure piston and extending loosely through the central opening in the guide piston, an abutment on the other end of said rod engaging the guide piston whereby the pressure piston is held yieldably in assembly with the guide piston, and means for the actuation of said pistons.

ERNST BROCEL. 

